Originally Posted by ST Eye
Subaru suggests 0w-20 because the engineered for that weight oil. That said I am going to keep using the proper weight oil. For 79letour I suppose it's worth giving it a shot though. Did Subaru recommend the heavier oil?
While i agree partially, i think a large partof the oil recommendation is to milk out that last .5mpg. I am using what i think is acceptable, it is just a little disappointing on a brand new car. When you consider my buick didn't start to use/leak oil until it got up to 160k, and that is a very old engine design with pretty crappy tolerances.